Leonardo Da Vinci fully intended for his works to be published and left them to his pupil, who couldn’t get through the writing and only managed to compile a treatise on painting in his lifetime, with the rest of his papers sold off by disinterested heirs.
the terminator did the same but not for painting...
That's not 100% accurate. He, and many before him dating back to Polykleitos of Classical Greece, studied the the aspects of proportion in nature (and the human body) to find the most perfect balance for art, architecture, and engineering.
The Vitruvian Man was an attempt to correct the inaccuracies of the calculations of the ancient Roman architect Vitruvius.
The calculations were used to create paintings and sculptures of the "perfect" human form, but not solely for that purpose.
I think you split the hair too fine. "Only" was an indirect reference to enhance the skill, not an imperative sigular aspect.
This is correct. Opinionated, but correct.